Rhino is not just a powerful NURBS 3D modeller. Coupled with the right plugin, it can be used to do some very interesting polygon-based subdivision modelling as well.

This is a  Rhino3D Video Demo of Subdivision modelling using Weaverbird. Weaverbird is a free Subdivision modelling plugin for Rhino. As of this writing, Weaverbird can be obtained from http://www.giuliopiacentino.com/weaverbird/ .

Hope that it is useful. 🙂